Required. The job to update. transferJob is expected to specify only three fields: description, transferSpec, and status. An UpdateTransferJobRequest that specifies other fields will be rejected with an error INVALID_ARGUMENT.

The field mask of the fields in transferJob that are to be updated in this request. Fields in transferJob that can be updated are: description, transferSpec, and status. To update the transferSpec of the job, a complete transfer specification has to be provided. An incomplete specification which misses any required fields will be rejected with the error INVALID_ARGUMENT.